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Nuclear Theory·nucl-th

Monday·August 25, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    Causality and Stability in Relativistic Hydrodynamics

    Sukanya Mitra

    The causality and stability of a relativistic hydrodynamic theory is shown to require a consensus between, either (i) newer degrees of freedom apart from the fundamental fluid fields, or (ii) a general hydrodynamic frame other than the Landau or Eckart compromising the field's first principle definition, unless the non-equilibrium derivative correction goes to infinity. Any finitely truncated derivative correction (no matter how high it is) is shown to lead to an acausal theory, unless the corrections are infinitely summed up to include all orders. From an underlying microscopic theory, an exact form of relativistic hydrodynamics has been derived which establishes that the resummation of all order temporal derivatives is essential for causality, which finally 'integrated in' as newer degrees of freedom.

    nucl-thhep-phhep-thJ.Subatomic Part.Cosmol.(2025)·1 citation
  2. 02

    Transport coefficients of hot and dense matter in relativistic heavy-ion collisions

    Sukanya Mitra🇮🇳

    The transport coefficients are known as the measure of system interactions, as well as the dynamical input of the hydrodynamic evolution equations of an expanding system created in the relativistic heavy ion collisions. In the current analysis, they have been evaluated for strongly interacting quark-gluon plasma system as well as hot hadronic media. The medium effects for an interacting QCD system have been introduced through a quasiparticle model. The same for a hadronic system has been captured via the in-medium self-energy correction using thermal field theory. The resulting behavior of the transport coefficients shows significant modification with respect to the estimations made in vacuum or using ideal equation of state.

    nucl-thhep-phhep-thJ.Subatomic Part.Cosmol.(2025)·0 citations
  3. 03

    Accurate spontaneous fission half-lives from a microscopic large-scale nuclear structure model

    Adrián Sánchez-Fernández · Silvia Bara · Wouter Ryssens · Stéphane Goriely

    We demonstrate the ability of the BSkG3 model to predict large-scale fission properties. In particular, we focus on the description of spontaneous fission half-lives, which are crucial for modeling the r-process. To assess the model accuracy, we compare predicted and experimental values for all nuclei with available data. The combination of BSkG3 predictive power for ground state and fission properties, the inclusion of triaxial and octupole degrees of freedom, the use of microscopic collective inertias, and the minimization of the action make our approach sophisticated yet practical when it comes to large-scale astrophysical applications.

    nucl-thPLB(2026)·5 citations
  4. 04

    Transversity Generalized Parton Distributions of with the Diquark Spectator Model

    Dongyan Fu🇨🇳 · Yubing Dong🇨🇳 · S. Kumano🇨🇳

    We show quark transversity generalized parton pistributions (GPDs) of isobar by using the diquark spectator model for the first time. First, this model is tested by electric charge, magnetic-dipole and axial charge form factors, and it is used for calculating the transversity GPDs of . The quark transversity distribution is then obtained from the transversity GPDs in the forward limit. Then, helicity-flip amplitudes are shown numerically by using relations between the helicity amplitudes and the GPDs. Finally, by taking first moments of the GPDs, tensor form factors are obtained and we predict the tensor charge. Experimentally, - transition GPDs are investigated in deeply virtual Compton scattering and virtual meson-production processes, and generalized distribution amplitudes, which correspond to the -channel GPDs, could be investigated by the two-photon processes at the electron-positron colliders. Therefore, the spin-3/2 GPDs could become interesting quantities experimentally in future.

    ↳ hep-phhep-exhep-latnucl-thPRD(2025)·1 citation
  5. 05

    -mode Oscillations for Hyperons and H-dibaryons in Neutron Stars

    Rajesh Maiti🇮🇳 · Jesper Leong🇦🇺 · Debarati Chatterjee🇮🇳 · Anthony W. Thomas🇦🇺

    The fundamental (-mode) oscillations of neutron stars are studied within the quark meson coupling model, a relativistic Hartree-Fock theory of dense nuclear matter, which takes into account the self-consistent modification of the valence quark structure of the bound baryons in the associated strong Lorentz scalar mean fields. For the first time, hyperons and H-dibaryons are included, along with the effects of potential additional short-range repulsion within this scheme, and their influence on -modes is investigated. Universal relations are studied within the relativistic Cowling approximation and compared against those in the existing literature for potential applications in gravitational wave asteroseismology.

    ↳ astro-ph.HEnucl-thPRD(2026)·1 citation
  6. 06

    Role of symmetry energy at subnuclear densities in protoneutron star crusts

    Ken'ichiro Nakazato🇯🇵 · Hajime Togashi🇯🇵 · Kohsuke Sumiyoshi🇯🇵 · Hideyuki Suzuki🇯🇵

    The impact of matter properties at subnuclear densities on the evolution of protoneutron stars is investigated. Several models of nuclear equation of state (EOS) are constructed with varying saturation parameters, particularly the symmetry energy and its density slope . Using the Thomas--Fermi approximation, the mass and proton numbers of heavy nuclei at subnuclear densities are systematically evaluated, along with their dependence on the EOS. Cooling simulations of protoneutron stars reveal that EOSs with smaller values lead to a longer cooling timescale and higher average neutrino energies. This behavior is attributed to the enhanced neutrino scattering caused by larger mass numbers, which increases the thermal insulation. Furthermore, the crystallization temperature, marking the onset of crust formation, is found to be higher for EOSs with smaller values of . This is due to the enhanced Coulomb energy associated with larger proton numbers. As a result, despite slower cooling, crust formation occurs earlier for smaller- EOSs. These findings indicate that the timing of crust formation is sensitive to the EOS and highlight the importance of late-time neutrino observations as probes of the matter properties at subnuclear densities.

    ↳ astro-ph.HEnucl-thPTEP(2025)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE